Can't find the weak spot in my pc

[Blubber]

I use 5 different WOW folders one one HD.

If you use junctions or links for your Data and Cache directories, you will get better performance. I don't know how it's done in XP though, in Vista it's done using mklink. Maybe you can use that to search on the forums or google.

Does a 64bit OS give's me better stats? I always tought that when the game is 32 bits it doesnt matters what your OS is? :huh:

Well, yes and no. Your 32bit application will most probably not run better on a 64bit os. However, 32bit windows can only address 4GB or ram + video memory. Assuming you have a 512mb video card, you are currently wasting 512 MB of your RAM. So upgrading to 64bit will help in this case.

And then the noob answer. What is a SSD?
I looked it up in wiki :S . A storage device for ram? ?

Solid State Disk. It's a kind of hard disk that doesn't use any moveing parts. It's like the memory in your digital camera, but with an interface your PC can use.

I'd say your PC is fast enough to run 5 wows. My dual-core AMD 3600+, which is over a year old runs 5 wows, it only lags in cities, and even then it takes just a couple seconds to load everyone up.

Do the symlinking/junction stuff for the Cache and Data directories. That should help, also, do you have the lowest settings on your clones? You can use

/console maxfps 15

on the clones to cap their framerate at 15 fps.